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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a90f4f310d29b9a9026b384c04a22baaa6ce00d33163b6791bb9d5589bbc409' 
  AND token = 'KhlEH5g10aETDvxx6ht+WPfXuJ29Fn4mUpfTz5d13p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}